Yamaha YZF-R1 2000 Supplementary Service Manual page 67

ELECTRIC STARTING SYSTEM
EB803511
Checking The Starter Motor
1. Check:
2. Measure:
3. Measure:
NOTE:
The mica must be undercut to ensure proper op-
eration of the commutator.
4. Measure:
a. Measure the armature assembly resistances
b. If any resistance is out of specification, re-
–59–
S commutator
Dirt ! Clean with 600 grit sandpaper.
S commutator diameter a
Out of specification ! Replace the starter
motor.
Min. commutator diameter
23.5 mm
S mica undercut a
Out of specification ! Scrape the mica to the
proper measurement with a hacksaw blade
which has been grounded to fit the commuta-
tor.
Mica undercut
1.5 mm
S armature assembly resistances (commuta-
tor and insulation)
Out of specification ! Replace the starter
motor.
with the pocket tester.
Pocket tester
90890-03112
Armature assembly
Commutator resistance 1
Continuity
NO continuity
Insulation resistance 2
Above 1 M at 20_C
place the starter motor.
ELEC
OK
NG